7 shocking CTA stories of 2015

Zbigniew Bzdak / Chicago Tribune

One of the more shocking stories of 2015 happened in mid-September, when a Blue Line train pulled out of the Damen station with a door open on a car full of passengers.

Passengers in the train car yelled for someone to pull the emergency brake after trying to stop the train by pulling on the red knob near the open door with no luck, according to Walid Mendez, a passenger who was in the train car when it happnened.

As the train picked up speed, a man pulled an emergency brake knob and the train came to a stop. A CTA worker came through the train and was able to reset the doors, allowing them to close.

While many of us travel by bus or train all over the city without a hitch - beyond the delays and crowds - there were a handful of shocking stories - from reported crimes to acts of kindness - that stood out in 2015.

There was the couple on the Blue Line who's picture went viral after a rider witnessed them giving money to a homeless man on the train or the Good samaritan who chased after a man after witnessing him rob a woman on a CTA platform.

Then there was the CTA train full of passengers that pulled out of a Blue Line station - with one of the doors still wide open. And who can forget the sad story of the man who slipped, fell and was killed while chasing after a CTA bus.

After a woman was sexually assaulted and brutally beaten on a Blue Line train, the CTA released surveillance photos of the suspect - later identified as a 15-year-old boy. It was the teen's mother who turned him in to authorities after seeing the photos.

In stranger crime news, a puppy was stolen at knifepoint on the Orange Line. And a series of brand new trains were vandalized in one of the worst graffiti attacks the CTA has seen in years.

Click on the photo above to page through the photos and learn more about the most shocking CTA stories of 2015.